פירוש על עמוס 2:9

as oaks Heb. אַלוֹנִים, kesnes (chenes) in French.

his fruit from above—I.e, the celestial princes. [from Midrash Tanchuma, Devarim 4; Tanchuma Buber, Addendum to Devarim 8]

and his roots from below—I. e, the earthly princes. Another explanation: the wasp would blind their eyes from above and castrate them from below. [from Sotah 36a]